<template>
  <div>
    <!-- 面包屑导航 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品分类</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图 -->
    <el-card>
      <!-- 添加商品分类按钮 -->
      <el-row>
        <el-button type="primary" class="cat_list" @click="showCateDialog">商品分类</el-button>
      </el-row>
      <!-- 表格区域 -->
      <tree-table
        :data="cateList"
        :columns="columns"
        show-index
        index-text="#"
        border
        :show-row-hover="false"
        :selection-type="false"
        :expand-type="false"
      >
        <!-- 是否有效 -->
        <template slot="isok" slot-scope="scope">
          <i class="el-icon-success" v-if="scope.row.cat_deleted===false" style="color:lightgreen"></i>
          <i class="el-icon-error" v-else style="color:red"></i>
        </template>
        <!-- 排序 -->
        <template slot="order" slot-scope="scope">
          <el-tag v-if="scope.row.cat_level===0" size="mini">一级</el-tag>
          <el-tag v-else-if="scope.row.cat_level===1" type="success" size="mini">二级</el-tag>
          <el-tag v-else type="danger" size="mini">三级</el-tag>
        </template>
        <!-- 操作 -->
        <template slot="opt" slot-scope="scope">
          <el-button type="primary" size="mini" icon="el-icon-edit">编辑</el-button>
          <el-button type="danger" size="mini" icon="el-icon-delete">删除</el-button>
        </template>
      </tree-table>

      <!-- 分页区域 -->
      <el-pagination
        @size-change="handleSizeChange"
        @current-change="handleCurrentChange"
        :current-page="queryinfo.pagenum"
        :page-sizes="[3, 5, 7, 9]"
        :page-size="queryinfo.pagesize"
        layout="total, sizes, prev, pager, next, jumper"
        :total="total"
      ></el-pagination>
    </el-card>
    <!-- 添加分类对话框 -->
    <el-dialog title="添加分类" :visible.sync="addCateDialogVisible" width="50%" @close="addCateDialogClosed">
      <!-- 添加分类表单 -->
      <el-form
        :model="addCateForm"
        :rules="addCateRules"
        ref="addCateRef"
        label-width="100px"
        class="demo-ruleForm"
      >
        <el-form-item label="分类名称" prop="cat_name">
          <el-input v-model="addCateForm.cat_name"></el-input>
        </el-form-item>
        <el-form-item label="父级分类">
            <!-- options绑定的原数据 -->
            <!-- props指定配置对象 -->
          <el-cascader
            change-on-select
            clearable
            v-model="selectedKeys"
            expand-trigger="hover"
            :options="parentsCateList"
            :props="cascaderProps"
            @change="parentCateChange"
          ></el-cascader>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addCateDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addCate">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>
<script>
export default {
  data() {
    return {
      queryinfo: {
        type: 3,
        pagenum: 1,
        pagesize: 5
      },
      // 获取商品分类列表数据，默认为空
      cateList: [],
      total: 0,
      // 分类对话框显示与隐藏
      addCateDialogVisible: false,
      //添加分类的表单数据对象
      addCateForm: {
        cat_name: "",
        cat_pid:0,
        cat_level:0
      },
      // 添加分类的表单验证
      addCateRules: {
        cat_name: [
          { required: true, message: "请输入分类名称", trigger: "blur" }
        ]
      },
      columns: [
        {
          label: "分类名称",
          prop: "cat_name",
          minWidth: "50px"
        },
        {
          label: "是否有效",
          // 模板类型
          type: "template",
          // 模板名称
          template: "isok"
        },
        {
          label: "排序",
          // 模板类型
          type: "template",
          // 模板名称
          template: "order"
        },
        {
          label: "操作",
          // 模板类型
          type: "template",
          // 模板名称
          template: "opt"
        }
      ],
      parentsCateList: [],
      cascaderProps:{
          value:'cat_id',
          label:'cat_name',
          children:'children'
      },
    //   选中的父节点分类的ID数组
    selectedKeys:[]
    };
  },
  created() {
    this.getCateList();
  },
  methods: {
    async getCateList() {
      const { data: res } = await this.$http.get("categories", {
        params: this.queryinfo
      });
      if (res.meta.status !== 200)
        return this.$message.error("获取商品分类列表失败");
      this.cateList = res.data.result;
      this.total = res.data.total;
    },
    handleSizeChange(newSize) {
      this.queryinfo.pagesize = newSize;
      this.getCateList();
    },
    handleCurrentChange(newPage) {
      this.queryinfo.pagenum = newPage;
      this.getCateList();
    },
    // 添加分类对话框显示
    showCateDialog() {
      // 调用父级分类的数据
      this.getParentsList();
      this.addCateDialogVisible = true;
    },
    // 获取父级分类列表数据
    async getParentsList() {
      const { data: res } = await this.$http.get("categories", {
        params: { type: 2 }
      });
      if (res.meta.status !== 200)
        return this.$message.error("获取分类列表数据失败");
      this.parentsCateList = res.data;
      console.log(this.parentsCateList);
    },
    parentCateChange() {
        // 如果选项中的长度>0则选中了父级分类，否则没有选中
        if(this.selectedKeys.length > 0) {
            this.addCateForm.cat_pid=this.selectedKeys[this.selectedKeys.length-1]
            this.addCateForm.cat_level=this.selectedKeys.length
            return
        } else {
            this.addCateForm.cat_pid=0
            this.addCateForm.cat_level=0
        }
    },
    addCate() {
        this.$refs.addCateRef.validate(async valid=> {
            if(!valid) return
            const {data:res}=await this.$http.post('categories',this.addCateForm)
            if(res.meta.status!==201) {
                return this.$message.error('添加分类失败')
            }
            this.$message.success('添加分类成功')
            this.getCateList()
            this.addCateDialogVisible=false
        })
    },
    // 重置分类表单
    addCateDialogClosed() {
        this.$refs.addCateRef.resetFields()
        this.selectedKeys=[]
        this.addCateForm.cat_pid=0
        this.addCateForm.cat_level=0
    }
  }
};
</script>>
<style lang="less" scoped>
.cat_list {
  margin-bottom: 15px;
}
.el-cascader {
    width: 100%;
}
</style>